From: Po Lu <luangruo@yahoo.com>
Date: Thu, 9 Mar 2023 00:52:54 +0000 (+0800)
Subject: Fix libwebp check for some webp installations
X-Git-Tag: emacs-29.0.90~216
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=7e1012765c4;p=emacs.git

Fix libwebp check for some webp installations

* configure.ac: Look for WebPGetInfo; if it is not there, look
for libwebpdecoder as well.  (bug#61988)
---

diff --git a/configure.ac b/configure.ac
index bc7e61048c3..ac93d003b70 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2806,6 +2806,25 @@ if test "${with_webp}" != "no"; then
       WEBP_MODULE="libwebpdemux >= $WEBP_REQUIRED"
 
       EMACS_CHECK_MODULES([WEBP], [$WEBP_MODULE])
+
+      # WebPGetInfo is sometimes not present inside libwebpdemux, so
+      # if it does not link, also check for libwebpdecoder.
+
+      OLD_CFLAGS=$CFLAGS
+      OLD_LIBS=$LIBS
+      CFLAGS="$CFLAGS $WEBP_CFLAGS"
+      LIBS="$LIBS $WEBP_LIBS"
+
+      AC_CHECK_FUNC([WebPGetInfo], [],
+        [WEBP_MODULE="$WEBP_MODULE libwebpdecoder >= $WEBP_REQUIRED"
+	 HAVE_WEBP=no
+	 AS_UNSET([WEBP_LIBS])
+	 AS_UNSET([WEBP_CFLAGS])
+	 EMACS_CHECK_MODULES([WEBP], [$WEBP_MODULE])])
+
+      CFLAGS=$OLD_CFLAGS
+      LIBS=$OLD_LIBS
+
       AC_SUBST([WEBP_CFLAGS])
       AC_SUBST([WEBP_LIBS])
    fi